Her father was Juan Fernandez de Castro, and her mother was Mayor de Renteria.
She married Diego (el Mozo) de Montemayor, son of Diego de Montemayor and Maria de Esquivel. Her husband died before 23 Jun 1614. He was 54 years old.
Diego Fernandez de Montemayor. He married Juliana de las Casas, daughter of Bernabe de las Casas and Maria Beatriz Navarro Rodriguez.